diff --git a/ACUtils.SqlDb/ACUtils.SqlDb.csproj b/ACUtils.SqlDb/ACUtils.SqlDb.csproj
index fe97431..29ecb3e 100644
--- a/ACUtils.SqlDb/ACUtils.SqlDb.csproj
+++ b/ACUtils.SqlDb/ACUtils.SqlDb.csproj
@@ -5,7 +5,7 @@
     <Authors>Andrea Cattaneo</Authors>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
-    <Version>1.0.0.146</Version>
+    <Version>1.0.0.147</Version>
     <PackageVersion>1.0.0.146</PackageVersion>
     <Description>Utility per interrogazione database MSSQL</Description>
     <NeutralLanguage>it</NeutralLanguage>
diff --git a/ACUtils.SqlDb/SqlDb.cs b/ACUtils.SqlDb/SqlDb.cs
index 5456d58..af37332 100644
--- a/ACUtils.SqlDb/SqlDb.cs
+++ b/ACUtils.SqlDb/SqlDb.cs
@@ -15,22 +15,14 @@ public class SqlDb : IDisposable
         public ILogger logger { get; protected set; }
         private TransactionScope scope;
 
-        private static MissingSchemaAction? missingSchemaAction;
-
         private bool _persistentConnection = false;
         private SqlConnection _connection = null;
-        public static MissingSchemaAction MissingSchemaAction
-        {
-            get
-            {
-                if (missingSchemaAction == null)
-                {
-                    missingSchemaAction = MissingSchemaAction.AddWithKey;
-                }
-                return missingSchemaAction.GetValueOrDefault();
-            }
-            set => missingSchemaAction = value;
-        }
+
+        private static MissingSchemaAction missingSchemaAction = MissingSchemaAction.AddWithKey;
+        public static MissingSchemaAction MissingSchemaAction { get => missingSchemaAction; set => missingSchemaAction = value; }
+
+        private static bool enforceConstraints = true;
+        public static bool EnforceConstraints { get => enforceConstraints; set => enforceConstraints = value; }
 
         #region constructor
         public SqlDb(string connectionString, ILogger logger, bool persistentConnection = false)
diff --git a/ACUtils.SqlDb/SqlDb_QueryDataSet.cs b/ACUtils.SqlDb/SqlDb_QueryDataSet.cs
index 005d832..1ee655a 100644
--- a/ACUtils.SqlDb/SqlDb_QueryDataSet.cs
+++ b/ACUtils.SqlDb/SqlDb_QueryDataSet.cs
@@ -82,6 +82,7 @@ private static DataSet _return(SqlCommand selectCommand)
             using (SqlDataAdapter adapter = new SqlDataAdapter(selectCommand))
             {
                 DataSet ds = new DataSet();
+                ds.EnforceConstraints = SqlDb.EnforceConstraints;
                 adapter.MissingSchemaAction = SqlDb.MissingSchemaAction;
                 adapter.Fill(ds);
                 return ds;
diff --git a/ACUtils.SqlDb/SqlDb_QueryMany.cs b/ACUtils.SqlDb/SqlDb_QueryMany.cs
index 3f8b7ee..f3d73a0 100644
--- a/ACUtils.SqlDb/SqlDb_QueryMany.cs
+++ b/ACUtils.SqlDb/SqlDb_QueryMany.cs
@@ -14,7 +14,7 @@ public static class SqlDb_QueryMany
             return QueryMany<T>(connection, queryString, new KeyValuePair<string, object>[0]);
         }
         #endregion
-        #region static with simple params 
+        #region static with simple params
         public static List<T> QueryMany<T>(SqlConnection connection, string queryString, params KeyValuePair<string, object>[] queryParams) where T : ACUtils.DBModel<T>, new()
         {
             return _return<T>(SqlDb_QueryDataTable.QueryDataTable(connection, queryString, queryParams));